<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>入门案例</title>
    <style>
        h1{
            color: red;
            font-size: 100px;
        }
    </style>
</head>
<body>
<h1>今天我最帅!!!</h1>
</body>
</html>